Most likely, that means that your Perl is not Active State Perl 5.10 on Windows XP/Vista/7 32bit .

Look at the output of perl -v, and see whether it is Perl 5.10. For me, this outputs

This is perl 5, version 12, subversion 1 (v5.12.1) built for MSWin32-x+86-multi-thread
Copyright 1987-2010, Larry Wall
Perl may be copied only under the terms of either the Artistic License+ or the
GNU General Public License, which may be found in the Perl 5 source ki+t.
Complete documentation for Perl, including FAQ lists, should be found +on
this system using "man perl" or "perldoc perl". If you have access to+ the
Internet, point your browser at http://www.perl.org/, the Perl Home Pa+ge.